IIT JEE Practice Question and Answer
8Q: Train K crosses a stationary Train L in 50 seconds and a pole in 20 seconds with the same speed. The length of the Train K is 240 meters. What is the length of stationary Train L ? 1076 05b5cc72ce4d2b4197774f75f
5b5cc72ce4d2b4197774f75f- 160 mtsfalse
- 2120 mtsfalse
- 3240 mtsfalse
- 4360 mtstrue
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Answer : 4. "360 mts"
Explanation :
Answer: D) 360 mts Explanation: Speed of the Train K is given by s = d/t = 240/20 = 12 m/sDistance covered by Train K in 50 seconds = 12 x 50 = 600 mts.But it crosses Train L in 50 seconds Therefore, the length of the Train L is = 600 - 240 = 360 mts.
Q: Only For Geniuses Solve this MathPuzzle if you can? 1076 05b5cc6b6e4d2b4197774d588
5b5cc6b6e4d2b4197774d588- Show Answer
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Answer :
Explanation :
Let the required number be 'X' Condition 1 : XX = 2X => 2X2 = X => X = 12 Condition 2 : X × X = X2=> X = 12 Therefore, 12 is the number which becomes double when it is divided by itself and becomes half when it is multiplied by itself.
Q: I go in hard. I come out soft. You blow me hard. What am I? 1075 05b5cc632e4d2b4197774b9d6
5b5cc632e4d2b4197774b9d6- Show Answer
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Answer :
Explanation :
Gum.
Q: Which of the following is an example of chemical weathering? 1075 05b5cc6a6e4d2b4197774cd38
5b5cc6a6e4d2b4197774cd38- 1Oxidationfalse
- 2Acid rainsfalse
- 3Carbonationfalse
- 4All the abovetrue
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Answer : 4. "All the above"
Explanation :
Answer: D) All the above Explanation: Chemical weathering is what happens when rocks are broken down and chemically altered. Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.
Q: Air pressure is measured in which of the following units? 1075 05b5cc694e4d2b4197774c47a
5b5cc694e4d2b4197774c47a- 1Steridianfalse
- 2kg/mtsfalse
- 3Newtonfalse
- 4Pascaltrue
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Answer : 4. "Pascal"
Explanation :
Answer: D) Pascal Explanation: Pressure = (Net Force) / (Applied area) = Newton / square meters Measuring units of pressure are: . Pascal. Bar. Torr. Pounds per square inch (psi). Standard atmosphere (atm).
Q: Consent of the People means 1074 05b5cc6b0e4d2b4197774d292
5b5cc6b0e4d2b4197774d292- 1All the Peoplefalse
- 2Majority of Peopletrue
- 3Leader of the Peoplefalse
- 4A few Peoplefalse
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Answer : 2. "Majority of People"
Explanation :
Answer: B) Majority of People Explanation: Consent of the People means the Majority of People, as expressed by votes in elections. Consent of the governed refers to the idea that a government's legitimacy and moral right to use state power is only justified and lawful when consented to by the people or society over which that political power is exercised.
Q: Order of basicity of amines in gaseous state? 1073 05b5cc67ee4d2b4197774c274
5b5cc67ee4d2b4197774c274- 12'> 1'> 3' > NH3false
- 23' > 2' > 1'> NH3true
- 31' > 2' > 3'> NH3false
- 42'> 3'> 1' > NH3false
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Answer : 2. "3' > 2' > 1'> NH3"
Explanation :
Answer: B) 3' > 2' > 1'> NH3 Explanation: The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding. So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic. But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.
Q: Atoms Are Composed Of 1073 05b5cc6bae4d2b4197774d799
5b5cc6bae4d2b4197774d799- 1Electrons and Protonsfalse
- 2Protons and Nucleifalse
- 3Only Electronsfalse
- 4Electrons and Nucleitrue
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Answer : 4. "Electrons and Nuclei"
Explanation :
Answer: D) Electrons and Nuclei Explanation: Atoms are composed of Electrons, protons and Neutrons. Protons and Neutrons together called as Nuclei.